Question

area of circle which has equilateral triangle inscribed

Answer 1

Answer:

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You can draw an equilateral triangle inside the circle, with vertices where the circle touches the outer triangle. Now, you know how to calculate the area of that inner triangle from Sal's video. Specifically, this is 3/4 * r^2 * sqrt(3). (When r=2 like in the video, this is 3 * sqrt(3).)

Answer 2

Answer:

are of circle πr^2

area of triangle=√3/4a^2